- Subject must have at least one measurable lesion as determined by diagnostic studies including CT or MRI or physical exam. Measurable disease must be accurately measured in at least one dimension (longest dimension to be recorded). Each lesion must be 20 mm in their longest dimension when measured by conventional techniques, including palpation, plain X-ray, CT and MRI, or 10 mm when measured by spiral CT. Palpable tumor masses that cannot be evaluated radiologically must have 2 diameters 20 mm. An attempt to document lesion size by ultrasound should be undertaken for palpable lesions not visualized on CT (or MRI).